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Life-time characteristics of random wound compressed stator windings under thermal stress

Lookup NU author(s): Dr Mehmet KulanORCiD, Dr Nick BakerORCiD



This is the authors' accepted manuscript of an article that has been published in its final definitive form by IET, 2019.

For re-use rights please refer to the publisher's terms and conditions.


Compression of windings is known to give thermal and performance benefits. The aim here is to investigate how the health of stator winding insulation systems are influenced by on-tooth coil pressing. A set of compressed coils have been aged by exposing them to high temperatures. Winding insulation resistance (IR) was monitored during this process to experimentally validate whether compressed coils remained healthy in terms of electrical insulation. In this case, a single stress (i.e. temperature) model is used to predict the reliability of the compressed coils. Accelerated life tests have been conducted to inspect the life expectancy and thermal endurance of the compressed stator coils. The employed statistical model (Arrhenius- Weibull) demonstrates that on-tooth coil pressing reduces the life expectancy dramatically due to reduced turn to ground wall insulation dielectric strength.

Publication metadata

Author(s): Kulan MC, Baker NJ

Publication type: Article

Publication status: Published

Journal: IET Electric Power Applications

Year: 2019

Volume: 13

Issue: 9

Pages: 1287-1297

Print publication date: 01/09/2019

Online publication date: 15/03/2019

Acceptance date: 12/03/2019

Date deposited: 11/04/2019

ISSN (print): 1751-8660

ISSN (electronic): 1751-8679

Publisher: IET


DOI: 10.1049/iet-epa.2018.5805


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